I used to create linetypes with specific names and apply the attribute value to that. another method is use a specific color. Or apply an attrbute to layer. You would probably have to have Map3d to accomplish this. But DXF is a simplified exchange format. There are not a lot of options unless you are a proficient programmer. images.autodesk.com/adsk/files/… or google.com/search?q=dxf+file+specifications
– Brad NesomAug 19 '15 at 17:57